diff --git a/common/tokens_test.go b/common/tokens_test.go
new file mode 100644
index 0000000..5634ab9
--- /dev/null
+++ b/common/tokens_test.go
@@ -0,0 +1,88 @@
+package common
+
+import (
+	"testing"
+)
+
+func TestParseAndScaleAmount(t *testing.T) {
+	tests := []struct {
+		name        string
+		amount      string
+		decimals    string
+		want        string
+		expectError bool
+	}{
+		{
+			name:        "whole number",
+			amount:      "123",
+			decimals:    "2",
+			want:        "12300",
+			expectError: false,
+		},
+		{
+			name:        "decimal number",
+			amount:      "123.45",
+			decimals:    "2",
+			want:        "12345",
+			expectError: false,
+		},
+		{
+			name:        "zero decimals",
+			amount:      "123.45",
+			decimals:    "0",
+			want:        "123",
+			expectError: false,
+		},
+		{
+			name:        "large number",
+			amount:      "1000000.01",
+			decimals:    "6",
+			want:        "1000000010000",
+			expectError: false,
+		},
+		{
+			name:        "invalid amount",
+			amount:      "abc",
+			decimals:    "2",
+			want:        "",
+			expectError: true,
+		},
+		{
+			name:        "invalid decimals",
+			amount:      "123.45",
+			decimals:    "abc",
+			want:        "",
+			expectError: true,
+		},
+		{
+			name:        "zero amount",
+			amount:      "0",
+			decimals:    "2",
+			want:        "0",
+			expectError: false,
+		},
+	}
+
+	for _, tt := range tests {
+		t.Run(tt.name, func(t *testing.T) {
+			got, err := ParseAndScaleAmount(tt.amount, tt.decimals)
+
+			// Check error cases
+			if tt.expectError {
+				if err == nil {
+					t.Errorf("ParseAndScaleAmount(%q, %q) expected error, got nil", tt.amount, tt.decimals)
+				}
+				return
+			}
+
+			if err != nil {
+				t.Errorf("ParseAndScaleAmount(%q, %q) unexpected error: %v", tt.amount, tt.decimals, err)
+				return
+			}
+
+			if got != tt.want {
+				t.Errorf("ParseAndScaleAmount(%q, %q) = %v, want %v", tt.amount, tt.decimals, got, tt.want)
+			}
+		})
+	}
+}